.slider {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.slider__wrapper {
  height: 100%;
  list-style: none;
  overflow: hidden;
  *zoom: 1;
  -webkit-backface-visibility: hidden;
  -webkit-transform-style: preserve-3d;
}
.slider__item {
  height: 100%;
  float: left;
  clear: none;
}
.slider__arrows-item {
  position: absolute;
  display: block;
  margin-bottom: -20px;
  padding: 20px;
}
.slider__arrows-item--right {
  bottom: 50%;
  right: 30px;
}
.slider__arrows-item--left {
  bottom: 50%;
  left: 30px;
}
.slider__nav {
  position: absolute;
  bottom: 20px;
}
.slider__nav-item {
  width: 12px;
  height: 12px;
  float: left;
  clear: none;
  display: block;
  margin: 0 5px;
  background: #fff;
  border: 1px solid #336;
  border-radius: 12px; /* 所有角都使用半径为6px的圆角，此属性为CSS3标准属性 */ 
  -moz-border-radius: 12px; /* Mozilla浏览器的私有属性 */ 
  -webkit-border-radius: 12px; /* Webkit浏览器的私有属性 */ 
}
.slider__nav-item--current {
  background: #669;
}
.slider__nav-item:hover {
  background: #669;
}

